package com.cqz.tools;

import java.security.MessageDigest;

/**
 * 生成MD5加密信息
 */
public class GeneratorMD5 {
    //**************************BEGIN MD5*************************************

    /**
     * 对pwd进行MD5二次加密，返回加密后的信息
     * @param pwd
     * @return
     */
    public static String getMd5(Object pwd)
    {
        String m1= null;
        try {
            m1 = GeneratorMD5.MD5Encode(pwd.toString());

            String pwd2=m1+""+m1;
            String m2=GeneratorMD5.MD5Encode(pwd2);

            return m2;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return m1;

    }

    private final static String[] hexDigits = {
            "0", "1", "2", "3", "4", "5", "6", "7",
            "8", "9", "a", "b", "c", "d", "e", "f"};

    /**
     * 转换字节数组为16进制字串
     * @param b 字节数组
     * @return 16进制字串
     */
    private static String byteArrayToHexString(byte[] b)
    {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
        {
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }
    /**
     * 转换字节为16进制字符串
     * @param b byte
     * @return String
     */
    private static String byteToHexString(byte b)
    {
        int n = b;
        if (n < 0)
            n = 256 + n;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }
    /**
     * 得到MD5的秘文密码
     * @param origin String
     * @throws Exception
     * @return String
     */
    public static String MD5Encode(String origin) throws Exception
    {
        String resultString = null;
        try
        {
            resultString=new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString=byteArrayToHexString(md.digest(resultString.getBytes()));
            return resultString;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
    //******************END  MD5******************

}
